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Old January 31st, 2008, 12:07 PM   #38
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Originally Posted by sledder View Post
99 7.3 Powerstroke, 3.73s. Tow everything from a car hauler to 10,000-pound travel trailer in overdrive. Rule of thumb, if you are under 55 mph lock it out or if you are climbing a hill lock it out. Another rule of thumb, stay over 75 mph and don’t worry about shifting out of overdrive. I think the key is don’t let the trans “hunt” or shift back and forth between 3rd and 4th.

IMO only use OD after you have reached your hiway cruising speed
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